Concat Strings

[paulo79]

Hi all,

Trying to concat this variable with strings but it is addind a line in output:

>>> del v_first_cell_name
>>> v_first_cell_name=subprocess.check_output("cat /tmp/p_f | sort -u | head -1", shell=True);
>>> v_first_cell_name=("physicaldisks_"+v_first_cell_name+".xml")
>>> print(v_first_cell_name)
physicaldisks_CELADM04
.xml
>>>

How to not ADD the ".xml" as new line, I mean, I want to add in same like to stay like physicaldisks_CELADM04.xml

[deanhystad]

Guess this is not related to your problem. But I have seen this using subprocess on Windows:

You are not concatenating strings. You are concatenating bytes and strings. You need to convert the bytes object returned by the subprocess call to a str.

Output:
>>> v_first_cell_name = subprocess.check_output("TYPE data.csv", shell=True)
>>> print(v_first_cell_name)
b'this_is_a_test'   #<-  See!  This is a bytes object, not str
>>> v_first_cell_name = v_first_cell_name.decode()    # <- Convert bytes to str           
>>> print(v_first_cell_name)
this_is_a_test    #<- Now it is a str.  no b''
>>> print("some prefix" + v_first_cell_name + "some suffix")
some prefixthis_is_a_testsome suffix

[Gribouillis]

Use .rstrip() to remove possible white space, including newline at the end

>>> 'CELADM04\n'.rstrip()
'CELADM04'
>>> 

[deanhystad]

Is getoutput() returning bytes instead of a str a windows thing? Or is it related to the command you execute?

[Gribouillis]

It seems to return bytes in linux too, but I don't know where it is documented.

[snippsat]

@paulo79 You most tell that for some reason still use Python 2.7💀
All answer you get here is for Python 3.
So deanhystad dos not info and answers for Python 3.
Python 2.7 did not return a bytes object as Python 3 dos.